STMicroelectronics

LD1117V50

LD1117V50 Description

The LD1117V50 is a fixed-output 5V, 800mA low-dropout (LDO) linear voltage regulator manufactured by STMicroelectronics. Designed for through-hole (TO-220AB) mounting, it offers stable voltage regulation with a maximum input voltage of 15V and a low dropout voltage of 1.2V at 800mA. This regulator is ideal for applications requiring reliable power management with minimal voltage fluctuations. Despite being marked as obsolete, it remains a robust choice for legacy designs due to its proven performance, overcurrent and overtemperature protection, and compliance with RoHS3 and REACH standards.

LD1117V50 Features

• Fixed 5V Output: Ensures consistent voltage delivery for precision circuits.
• High Current Capacity: Supports up to 800mA load current, suitable for moderate-power applications.
• Low Dropout Voltage: 1.2V @ 800mA minimizes power loss, enhancing efficiency.
• Excellent PSRR: 75dB at 120Hz reduces noise, making it ideal for sensitive analog/digital systems.
• Robust Protection: Includes overcurrent and overtemperature safeguards for enhanced reliability.
• Wide Operating Temperature: Functions reliably from 0°C to 125°C, suitable for industrial environments.
• Low Quiescent Current: 10mA Iq helps conserve power in standby modes.

LD1117V50 Applications

• Embedded Systems: Powering microcontrollers, sensors, and peripheral ICs in legacy designs.
• Industrial Controls: Suitable for PLCs, motor drivers, and instrumentation requiring stable 5V rails.
• Consumer Electronics: Used in set-top boxes, routers, and audio/video equipment.
• Automotive Electronics: Auxiliary power regulation in non-critical automotive subsystems.
• Test & Measurement Equipment: Provides clean power for precision analog circuits.

Conclusion of LD1117V50

The LD1117V50 is a dependable LDO regulator offering high current output, low dropout, and robust protection in a through-hole package. While obsolete, its high PSRR, wide temperature range, and compliance with environmental standards make it a viable option for maintenance, repairs, or legacy system designs. Engineers seeking a cost-effective, noise-resistant 5V regulator for industrial or consumer applications may still find value in this proven solution.